Porous film, method for manufacturing the same, gas permeability

Details Porous film, method for manufacturing the same, gas permeability Porous film, method for manufacturing the same, gas permeability

1994-04-12

1995-10-17

Lesmes, George F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428332, 428483, 428220, 428156, 264 41, 264154, B29C 6500, B28B 148, B32B 712, B32B 2736

Patent

active

054589517

ABSTRACT:
A gas permeability control film having a barrier property against water, bacteria, and viruses, an oxygen gas permeation amount controlled to fall within the range of 10.sup.3 to 10.sup.7 cc/m.sup.2 .multidot.24 hours.multidot.25.degree. C., and a controlled carbon dioxide gas permeation amount. The gas permeability control film has an organic film in which non-through pores having an average opening width falling within the range of 0.5 .mu.m to 150 .mu.m are formed at a density of 500 to 200,000 pores/cm.sup.2.

REFERENCES:
patent: 3709774 (1973-09-01), Kimura et al.
patent: 4250135 (1981-02-01), Orsini
patent: 4964992 (1990-10-01), Goldsmith et al.
patent: 4980100 (1990-12-01), Krishnakuma et al.
patent: 5114795 (1992-05-01), Perec et al.

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